topic Re: ObjectIdCollection transform to new point in same drawing in .NET Forum

ObjectIdCollection transform to new point in same drawing

manohar2375 — Mon, 18 Jul 2022 16:44:57 GMT

Hello Expertise,

Could you please help me with sample code to capture all ObjectIds within the Closed Polyline and transform/move them to new position at a time instead of one by one ObjectId in the same drawing. I know to transform one by one entity as below.

ent.TransformBy(Matrix3d.Displacement(new Vector3d(ptX, ptY, 0)));

But needs help to transform/move list of ObjectIds at a time in the same drawing.

Thanks in Advance.

Re: ObjectIdCollection transform to new point in same drawing

_gile — Mon, 18 Jul 2022 17:17:46 GMT

Hi,

Simply use a foreach loop.

Re: ObjectIdCollection transform to new point in same drawing

manohar2375 — Mon, 18 Jul 2022 17:30:14 GMT

Hi _gile,

Thanks for your reply with suggestion.

But, Is there any possibility to transform list of ObjectIds at a time without use foreach or any other loop.

Thanks in Advance.

Re: ObjectIdCollection transform to new point in same drawing

Ed__Jobe — Mon, 18 Jul 2022 17:35:50 GMT

Put the foreach in a function method or an extension method and then it acts like a single step.

Re: ObjectIdCollection transform to new point in same drawing

manohar2375 — Mon, 18 Jul 2022 17:48:37 GMT

Hi Ed.Jobe,

Thanks for reply with suggestion.

But i am thinking that, drawing will get heavy load and get impact on performance if we use foreach, so thinking that, is there any other way to transform all at a time.

For Example:

to capture all elements, will use selection set as below.

PromptSelectionResult res = ed.SelectCrossingPolygon(pnt3dColl, filter);

so, like that, is there any other way.

Thanks in Advance.

Re: ObjectIdCollection transform to new point in same drawing

Ed__Jobe — Mon, 18 Jul 2022 17:52:01 GMT

Even if you found an AutoCAD api method that did it, how do you think they would do it? Somehow, at a base level, you have to process them one at a time. A foreach is the simplest method.

Re: ObjectIdCollection transform to new point in same drawing

essam-salah — Tue, 19 Jul 2022 09:47:54 GMT

for loop will be faster than foreach

var ids = res.Value.GetObjectIds(); int count = ids.Length; Entity entity; var transform = Matrix3d.Displacement(new Vector3d(0, 0, 0)); for (int i = 0; i < count; i++) { entity = ids[i].GetObject(OpenMode.ForWrite) as Entity; entity.TransformBy(transform); }

Re: ObjectIdCollection transform to new point in same drawing

_gile — Tue, 19 Jul 2022 11:42:54 GMT

@essam-salah a écrit :

for loop will be faster than foreach

Are you sure about this ?

Did you test-it by yourself ?

If so, I should be interseted by how much faster is it ?

Rather than worrying about whether 'for' is faster than 'foreach', it is better to start by optimizing what you repeat at each iteration inside the loop.
A direct cast:

entity = (Entity)ids[i].GetObject(OpenMode.ForWrite);

is faster than a 'try cast' (which should only be used in conjunction with a : if (entity != null) ...

entity = ids[i].GetObject(OpenMode.ForWrite) as Entity;

See this dicussion.

Re: ObjectIdCollection transform to new point in same drawing

essam-salah — Wed, 20 Jul 2022 10:48:03 GMT

hi @_gile

thanks for the tip about Try Cast i always find smth helpful in your posts,

i tried both methods and here is the result:

Command: Command: neltao Unknown command "NELTAO". Press F1 for help. Command: NETLOAD Command: FORVSFOREACH entities count: 62,389.00 try cast: foreach1: 436.00 forloop: 356.00 without try cast: foreach2: 370.00 forloop2: 362.00 Command: FORVSFOREACH entities count: 62,389.00 try cast: foreach1: 422.00 forloop: 398.00 without try cast: foreach2: 362.00 forloop2: 365.00 Command: FORVSFOREACH entities count: 62,389.00 try cast: foreach1: 413.00 forloop: 370.00 without try cast: foreach2: 377.00 forloop2: 351.00 Command: FORVSFOREACH entities count: 62,389.00 try cast: foreach1: 377.00 forloop: 358.00 without try cast: foreach2: 363.00 forloop2: 402.00 Command: FORVSFOREACH entities count: 62,389.00 try cast: foreach1: 365.00 forloop: 350.00 without try cast: foreach2: 370.00 forloop2: 373.00

[CommandMethod("ForVsForeach")] public void ForAndForeach() { #region curr doc var adoc = Application.DocumentManager.MdiActiveDocument; var adb = adoc.Database; var editor = adoc.Editor; var cdoc = cApp.CivilApplication.ActiveDocument; #endregion Stopwatch stopWatch = new Stopwatch(); var ids = editor.SelectAll().Value.GetObjectIds(); int count = ids.Length; Entity entity; var transform = Matrix3d.Displacement(new Vector3d(22.22, 33.33, 0)); editor.WriteMessage($"\n entities count: {count,0:#,0.00} \n"); //////////////////////////////// try cast ///////////////////////////////////////////// editor.WriteMessage($"\n\t try cast: \n"); stopWatch.Reset(); using (var tr = adb.TransactionManager.StartTransaction()) { stopWatch.Start(); foreach (var id in ids) { entity = id.GetObject(OpenMode.ForWrite) as Entity; entity.TransformBy(transform); } stopWatch.Stop(); //tr.Commit(); } editor.WriteMessage($"\n\t\t\t foreach1: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n"); stopWatch.Reset(); using (var tr = adb.TransactionManager.StartTransaction()) { stopWatch.Start(); for (int i = 0; i < count; i++) { entity = ids[i].GetObject(OpenMode.ForWrite) as Entity; entity.TransformBy(transform); } stopWatch.Stop(); //tr.Commit(); } editor.WriteMessage($"\n\n\t\t\t forloop: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n"); ////////////////////////////////without try cast///////////////////////////////////////////// editor.WriteMessage($"\n\t without try cast: \n"); stopWatch.Reset(); using (var tr = adb.TransactionManager.StartTransaction()) { stopWatch.Start(); foreach (var id in ids) { entity = (Entity)id.GetObject(OpenMode.ForWrite); entity.TransformBy(transform); } stopWatch.Stop(); //tr.Commit(); } editor.WriteMessage($"\n\n\t\t\t foreach2: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n"); stopWatch.Reset(); using (var tr = adb.TransactionManager.StartTransaction()) { stopWatch.Start(); for (int i = 0; i < count; i++) { entity = (Entity)ids[i].GetObject(OpenMode.ForWrite); entity.TransformBy(transform); } stopWatch.Stop(); //tr.Commit(); } editor.WriteMessage($"\n\n\t\t\t forloop2: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n\n"); }